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United States Patent | 5,652,527 |
Phillips ,   et al. | July 29, 1997 |
An input/output circuit for increasing immunity to voltage spikes from voltage supplies is provided. The circuit includes a first pair of transistors each having their drains connected to an output terminal and their sources connected to voltage supplies. A mechanism is connected to electrically separated voltage supplies to alternately turn on one of the first pair of transistors responsive to an input signal. A transistor is utilized to provide feedback to limit the rise in a ground voltage supply as occurs during ground bounce.
Inventors: | Phillips; Christopher E. (San Jose, CA); Ahrens; Michael G. (Sunnyvale, CA); Nolan, III; Joseph G. (San Jose, CA); Cooke; Laurence H. (San Jose, CA) |
Assignee: | Crosspoint Solutions (Milpitas, CA) |
Appl. No.: | 466556 |
Filed: | June 6, 1995 |
Current U.S. Class: | 326/83; 326/16; 326/17; 326/27; 326/33; 327/108 |
Intern'l Class: | H03K 019/01; H03K 019/017.5 |
Field of Search: | 326/83,17,16,27,33 327/108 |
4862018 | Aug., 1989 | Taylor et al. | 326/83. |
5138194 | Aug., 1992 | Yoeli | 326/83. |
5394034 | Feb., 1995 | Becker et al. | 326/83. |
5430335 | Jul., 1995 | Tanoi | 327/108. |